International Chemistry Olympiad - IChO - For the competition purposes, all the competitors will be given a calculator Casio fx-991EX. The manual for the calculator can be downloaded from the following link:
Casio ClassWiz Fx-991EX Scientific Calculator Has A Spreadsheet Function - SlashGear
Casio fx-991EX Classwiz for High School Students: Getling, David: 9781548247102: Amazon.com: Books
Using Scientific Constants On A Casio Classwiz fx-991EX | fx-570EX Physics Formula - YouTube
Function Calculations - Casio fx-82EX User Manual [Page 13] | ManualsLib
Amazon.com : Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" : Office Products
Getting Started with CASIO FX-991EX FX-570EX CLASSSWIZ Full Manual learn all features - YouTube
Getting Started with Casio Classwiz FX-991EX FX-87DEX FX-570EX Calculator - YouTube